Double-jack swinging bracket for gang-saws.



L. G. JOHNSTONE. DOUBLE JACK SWINGING BRACKET FOR GANG SAWS.

APPLICATION FILED JULYIB, 1908.

Patented June 15,1909.

-Hl'i II WHI m! THE Name PEYERS co., wnsmmmm, a. c.

LLOYD .lOllh 8 TONE, OF NEW YORK, N. Y.

DOUBLE-JACK SWINGING BRACKET FOR GANG-SANS.

To all whom it may concem:

Be it known that l, LLOYD G. Jor-nzsronn, a citizen of the United States of America, residing at New York, in the borough of the Bronx, county and State of New York, have invented certain new and useful Improve- .nients in Double-Jack Swingiu Brackets for Gang-Saws, of which the following is a specilication.

This invention relates to an improved double-jack swinging bracket for gang-saws.

Gang-saws for cutting marble and other stones are suspended by jacks which are applied to the frames of the gang-saws. Gwing to the sand used in the sawing of the slabs, the suspension-pivots are rapidly worn out by friction, especially when there are no means for inclosing and protecting the same. This produces considerable expense as the suspension-pivots have to be frequently re placed, whereby the work of the gang-saws is interrupteril and delayed.

The object of this invention is to furnish an improved swinging bracket for gang-saws by which the suspension-pivot is inclosed and protected against wear and ingress of sand; and for this purpose the invention consists of a swinging bracket for gang-saws, which comprises a double jack, a pivot pin suspended in the openings of the j ack, a bushing placed on the suspension-pivot between the uprights of the jack, a box for inclosing the pivot consisting of three partsa lower bearing block, an upper bearing block and a cover, the lower bearing block and cover being connected by suitable bolts so as to inclose entirely the suspension-pivot and bushing, as will be fully described hereinafter and finally pointed out in the claims.

In the accompanying drawing, Figure l represei'its perspective view of one corner of a gang-saw showing my improved doublejack swinging bracket thereon, Fig. 2 is a sideelevation of the swinging bracket, and Fig. 3 is a vertical transverse section on line 3, 3, Fig. 2.

Similar letters of reference indicate corre sponding parts.

Referring to the drawing, a represents one corner of the frame of a gang-saw for cutting marble, granite and other stones. The frame of the gang-saw is suspended from fourswinging brackets which are attached thereto and to which the suspension-rods r for the gangsaw are applied.

My improved swinging bracket is com- Specification of Letters Patent.

Application filed July 16, 1908.

Patented June 15, 1909.

Serial No. 448,763.

posed of a double jack 7) which is provided with a base-plate and an angle-plate 6 which extends downward so as to be at tached to the frame of the gang-saw, as

shown in Fig. l. The upper ends of the double jack 7) are provided with. openings for receiving the suspension-pivot c of the swinging bracket which pivot is splined to the double jack. The suspension-pivot c is surrounded between the uprights of the double jack by a bushin d of steel or other suitable material, which is splined to the suspensionpivot c and thereby prevented from turning. The bushing d is surrounded by a casing, lined with Babbittnnetal which consists of a lower bearing block 6 that is placed between the uprights of the double jack and provided with shouldered ends, an upper bearing block a which bears on the upper part of the bushing and which is provided with a conical inlet-opening e for conducting the lubricating material to the bushing, said conical opening being connected by a channel 6 in the upper bearing block with a supply-pipe c for the lubricating oil. A cavity is arranged in the lower bearing block to which the lubrieating material is supplied from time to time by a channel 6 and a plugged pipe e at its outer end, as shown clearly in Fig. 2. The upper bearing block which surrounds the upper part of the bushing is inclosed by a cover f, the side-wallsf of which extend over the upper sidewalls of the double jack and the outer ends of the suspension-pivot c, as shown in Fig. 3. is provided with shouldered ends f which are recessed for surrounding the shouldered ends of the lower bearing block surrounding the lower part of the bushing. The shouldered ends f 2 of the cover f are connected by means of boltsf and nuts f" with the shouldered ends of the lower bearing block so as to hold. the same tightly in position on the bushing and. permit the bearing blocks to swing freely on the same. On the upper portion of the cover f is located a raised bossf that is preferably cast integral with the cover and provided in the center so as to form an interiorly threaded socket into which the suspension-rod r for the gang-saw is screwed. A binding screw-nut f holds the suspensionrod 7" tightly in the socket after it is screwed home on the same.

The upper semicircular bearing-b1ock is tightly adjusted on the suspension-pivot by means of adjustable set-screws 9 provided llhe upper bearing block f with jam-nuts 9 below their heads, the jamnuts and the socket for the suspension-rod 7" being covered by a cap 7L provided with an interior shoulder 7L1 which fits over the socket f and which is held in position by a collar i on the cap and a set-screw 41 passing through the collar, so as to hold the cap tightly in position and prevent the ingress of sand below the same to the set-screws g. The adjustable set-screws g serve to take up the slack of the upper bearing block due to the wearing oil of the Babbitt-metal lining of the same.

A uniform feed of lubricating oil is supplied to the upper bearing-block and from the same along the bushing to the cavity in the lower bearing block, as shown in Fig. 2, while a separate supply of lubricating material is given from time to time to the lower bearing block.

The base of the double ack is tightly attached to the supporting frame of the gangsaw so as to form thereby a strong and reliable support for the suspension-pivot. As the suspension-pivot, its bushing and the bearing blocks are fully protected. by the cover and cap against the ingress of sand and the bearing blocks are thoroughly lubricated during the oscillating motion of the blocks and cover, the gang-saw moves always in a horizontal position without any parts except the bushing wearing out so that the frequent and expensive renewal of pivots of the swinging brackets heretofore in use is obviated an d a better and superior suspensionbracket for the gang-saw obtained. The bushing is the only part that requires renewal and that only at long intervals, when it can be replaced at comparatively small expense.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. A swinging bracket for gang-saws, comprising a double jack attached to the frame oi the gang-saw, suspension-pivot splined to the upper part of the jack, a bushing surrounding the pivot between the uprights of the double jack, bearing-blocks surrounding the bushing, the lower bearing-block being provided. with shoulders at opposite ends, a

cover the side-walls of which extend over the sisting of a double jack attached to the frame of the gang-saw, a suspension-pivot supported by said jack, a bushing surrounding said suspension-pivot, a lower bearing-block, an upper bearing-block, a cover extending over the upper bearing-block, the side-walls of the jack and the ends of the suspension-pivot, means for connecting the ends of the lower bearing block with the ends of the cover, means for lubricating the bearing-blocks independently of each other, means for setting the upper bearing-block, a socket on the upper part of the cover, a suspension-rod inserted securely in said socket, a cap extending over the setting means for the upper bearing-block, and means for securing the cap in position.

8. A swinging bracket for gang-saws, consisting of a double ack attached to the frame of the gang-saw, a suspension-pivot splined to said jack, a bushing surrounding said suspension pivot and splined thereto, bearingblocks surrounding said pivot, the lower bearing-block being provided with shouldered ends, a cover exten ding over the upper bearing-block, the upper part of the jack and the ends of the suspension-pivot, said cover being provided with shouldered ends, means for connecting the shouldered. ends of the lower bearing-block and the cover, means for lubricating the upper bearing-block, and separate means for lubricating the lower bearing-block independently oi the upper bearing-block.

4. A swinging bracket for gang-saws, consisting oi a double jack attached to the frame of the gangsaw, a suspension-pivot splined to said jack, a bushing surrounding said suspensionpivot and splined thereto, bearingblocks surrounding said pivot, the lower bearing-block being provided with shouldered ends, a cover extending over the upper bearing-block, the upper part of the jack and the ends of the suspension-pivot, said cover being provided with shouldered ends, means for connecting the shouldered ends of the lower bearing-block with the shouldered ends of the cover, adjustable set-screws passing through the cover onto the upper bearingblock, a cap extending over said set-screws, means for securing the cap in position, and means attached to the cover for suspending the swinging bracket.

In testimony, that I claim the foregoing as my invention, I have signed my name in presence or two subscribing witnesses.

LLOYD G. JOHNSTONE.

Witnesses:

PAUL GOEPEL, HENRY J. SUHRBIER. 

